399923916 has 24 divisors (see below), whose sum is σ = 1066464000. Its totient is φ = 114263952.

The previous prime is 399923879. The next prime is 399923917. The reversal of 399923916 is 619329993.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (399923917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2380416 + ... + 2380583.

It is an arithmetic number, because the mean of its divisors is an integer number (44436000).

Almost surely, 2^399923916 is an apocalyptic number.

It is an amenable number.

399923916 is an abundant number, since it is smaller than the sum of its proper divisors (666540084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399923916 is a wasteful number, since it uses less digits than its factorization.

399923916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4761013 (or 4761011 counting only the distinct ones).

The product of its digits is 708588, while the sum is 51.

The square root of 399923916 is about 19998.0978095418. The cubic root of 399923916 is about 736.7595807904.

The spelling of 399923916 in words is "three hundred ninety-nine million, nine hundred twenty-three thousand, nine hundred sixteen".